I don't see any jump now in Firefox or chrome. Where do you see a jump?

There isn't actually anywhere for the thumbnails to jump because the image is holding the space open which is what the image attributes do. The browsers allocates the space in the image attributes so even while the image is loading the space will be held open.

ttmt
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2013-05-10T16:44:48Z —
#5

I see a jump between each large image loading - the spinning loader comes on and the thumbnails jump to the top of the page.

Once the images have loaded it stops but if the cache is cleared and the images are loading first time there is a definite jump.

I'm using Mac - Chrome, Safari and Firefox.

PaulOB
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2013-05-10T19:37:10Z —
#6

Hi.

I checked on a mac and I can see its jumping in Chrome on the Mac but Firefox seems to be ok.

It's probably because your script is hiding the image rather than just setting it to visibility:hidden and letting it take space up on the page.

You could try adding a duplicate image just to hold the page open if you can't change the script.